Skip to content

Move function info word into its own data structure #153627

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Aug 15, 2025
Merged

Move function info word into its own data structure #153627

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
a2b6288
Move function info word into its own data structure
Sterling-Augustine Aug 14, 2025
16549c1
Endianify FuncInfo
Sterling-Augustine Aug 14, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 11 additions & 7 deletions llvm/include/llvm/BinaryFormat/SFrame.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -104,14 +104,8 @@ template <endianness E> struct Header {
detail::packed<uint32_t, E> FREOff;
};

template <endianness E> struct FuncDescEntry {
detail::packed<int32_t, E> StartAddress;
detail::packed<uint32_t, E> Size;
detail::packed<uint32_t, E> StartFREOff;
detail::packed<uint32_t, E> NumFREs;
template <endianness E> struct FDEInfo {
detail::packed<uint8_t, E> Info;
detail::packed<uint8_t, E> RepSize;
detail::packed<uint16_t, E> Padding2;

uint8_t getPAuthKey() const { return (Info >> 5) & 1; }
FDEType getFDEType() const { return static_cast<FDEType>((Info >> 4) & 1); }
Expand All @@ -125,6 +119,16 @@ template <endianness E> struct FuncDescEntry {
}
};

template <endianness E> struct FuncDescEntry {
detail::packed<int32_t, E> StartAddress;
detail::packed<uint32_t, E> Size;
detail::packed<uint32_t, E> StartFREOff;
detail::packed<uint32_t, E> NumFREs;
FDEInfo<E> Info;
detail::packed<uint8_t, E> RepSize;
detail::packed<uint16_t, E> Padding2;
};

template <endianness E> struct FREInfo {
detail::packed<uint8_t, E> Info;

Expand Down
4 changes: 2 additions & 2 deletions llvm/lib/Object/SFrameParser.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -173,10 +173,10 @@ iterator_range<typename SFrameParser<E>::fre_iterator>
SFrameParser<E>::fres(const sframe::FuncDescEntry<E> &FDE, Error &Err) const {
uint64_t Offset = getFREBase() + FDE.StartFREOff;
fre_iterator BeforeBegin = make_fallible_itr(
FallibleFREIterator(Data, FDE.getFREType(), -1, FDE.NumFREs, Offset),
FallibleFREIterator(Data, FDE.Info.getFREType(), -1, FDE.NumFREs, Offset),
Err);
fre_iterator End = make_fallible_end(
FallibleFREIterator(Data, FDE.getFREType(), FDE.NumFREs, FDE.NumFREs,
FallibleFREIterator(Data, FDE.Info.getFREType(), FDE.NumFREs, FDE.NumFREs,
/*Offset=*/0));
return {++BeforeBegin, End};
}
Expand Down
21 changes: 12 additions & 9 deletions llvm/tools/llvm-readobj/ELFDumper.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6505,25 +6505,27 @@ void ELFDumper<ELFT>::printSFrameFDEs(

{
DictScope InfoScope(W, "Info");
W.printEnum("FRE Type", It->getFREType(), sframe::getFRETypes());
W.printEnum("FDE Type", It->getFDEType(), sframe::getFDETypes());
W.printEnum("FRE Type", It->Info.getFREType(), sframe::getFRETypes());
W.printEnum("FDE Type", It->Info.getFDEType(), sframe::getFDETypes());
switch (Parser.getHeader().ABIArch) {
case sframe::ABI::AArch64EndianBig:
case sframe::ABI::AArch64EndianLittle:
W.printEnum("PAuth Key", sframe::AArch64PAuthKey(It->getPAuthKey()),
W.printEnum("PAuth Key",
sframe::AArch64PAuthKey(It->Info.getPAuthKey()),
sframe::getAArch64PAuthKeys());
break;
case sframe::ABI::AMD64EndianLittle:
// unused
break;
}

W.printHex("Raw", It->Info);
W.printHex("Raw", It->Info.Info);
}

W.printHex(
("Repetitive block size" +
Twine(It->getFDEType() == sframe::FDEType::PCMask ? "" : " (unused)"))
Twine(It->Info.getFDEType() == sframe::FDEType::PCMask ? ""
: " (unused)"))
.str(),
It->RepSize);

Expand All @@ -6534,10 +6536,11 @@ void ELFDumper<ELFT>::printSFrameFDEs(
for (const typename SFrameParser<ELFT::Endianness>::FrameRowEntry &FRE :
Parser.fres(*It, Err)) {
DictScope FREScope(W, "Frame Row Entry");
W.printHex(
"Start Address",
(It->getFDEType() == sframe::FDEType::PCInc ? FDEStartAddress : 0) +
FRE.StartAddress);
W.printHex("Start Address",
(It->Info.getFDEType() == sframe::FDEType::PCInc
? FDEStartAddress
: 0) +
FRE.StartAddress);
W.printBoolean("Return Address Signed", FRE.Info.isReturnAddressSigned());
W.printEnum("Offset Size", FRE.Info.getOffsetSize(),
sframe::getFREOffsets());
Expand Down
44 changes: 22 additions & 22 deletions llvm/unittests/BinaryFormat/SFrameTest.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -54,28 +54,28 @@ TYPED_TEST_SUITE(SFrameTest, Types, NameGenerator);

TYPED_TEST(SFrameTest, FDEFlags) {
FuncDescEntry<TestFixture::Endian> FDE = {};
EXPECT_EQ(FDE.Info, 0u);
EXPECT_EQ(FDE.getPAuthKey(), 0);
EXPECT_EQ(FDE.getFDEType(), FDEType::PCInc);
EXPECT_EQ(FDE.getFREType(), FREType::Addr1);

FDE.setPAuthKey(1);
EXPECT_EQ(FDE.Info, 0x20u);
EXPECT_EQ(FDE.getPAuthKey(), 1);
EXPECT_EQ(FDE.getFDEType(), FDEType::PCInc);
EXPECT_EQ(FDE.getFREType(), FREType::Addr1);

FDE.setFDEType(FDEType::PCMask);
EXPECT_EQ(FDE.Info, 0x30u);
EXPECT_EQ(FDE.getPAuthKey(), 1);
EXPECT_EQ(FDE.getFDEType(), FDEType::PCMask);
EXPECT_EQ(FDE.getFREType(), FREType::Addr1);

FDE.setFREType(FREType::Addr4);
EXPECT_EQ(FDE.Info, 0x32u);
EXPECT_EQ(FDE.getPAuthKey(), 1);
EXPECT_EQ(FDE.getFDEType(), FDEType::PCMask);
EXPECT_EQ(FDE.getFREType(), FREType::Addr4);
EXPECT_EQ(FDE.Info.Info, 0u);
EXPECT_EQ(FDE.Info.getPAuthKey(), 0);
EXPECT_EQ(FDE.Info.getFDEType(), FDEType::PCInc);
EXPECT_EQ(FDE.Info.getFREType(), FREType::Addr1);

FDE.Info.setPAuthKey(1);
EXPECT_EQ(FDE.Info.Info, 0x20u);
EXPECT_EQ(FDE.Info.getPAuthKey(), 1);
EXPECT_EQ(FDE.Info.getFDEType(), FDEType::PCInc);
EXPECT_EQ(FDE.Info.getFREType(), FREType::Addr1);

FDE.Info.setFDEType(FDEType::PCMask);
EXPECT_EQ(FDE.Info.Info, 0x30u);
EXPECT_EQ(FDE.Info.getPAuthKey(), 1);
EXPECT_EQ(FDE.Info.getFDEType(), FDEType::PCMask);
EXPECT_EQ(FDE.Info.getFREType(), FREType::Addr1);

FDE.Info.setFREType(FREType::Addr4);
EXPECT_EQ(FDE.Info.Info, 0x32u);
EXPECT_EQ(FDE.Info.getPAuthKey(), 1);
EXPECT_EQ(FDE.Info.getFDEType(), FDEType::PCMask);
EXPECT_EQ(FDE.Info.getFREType(), FREType::Addr4);
}

TYPED_TEST(SFrameTest, FREFlags) {
Expand Down